package com.weed.helper;



public class Escape {
  private final static String[] hex = {
      "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0A", "0B",
      "0C", "0D", "0E", "0F",
      "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B",
      "1C", "1D", "1E", "1F",
      "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2A", "2B",
      "2C", "2D", "2E", "2F",
      "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B",
      "3C", "3D", "3E", "3F",
      "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4A", "4B",
      "4C", "4D", "4E", "4F",
      "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5A", "5B",
      "5C", "5D", "5E", "5F",
      "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6A", "6B",
      "6C", "6D", "6E", "6F",
      "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7A", "7B",
      "7C", "7D", "7E", "7F",
      "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8A", "8B",
      "8C", "8D", "8E", "8F",
      "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9A", "9B",
      "9C", "9D", "9E", "9F",
      "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA", "AB",
      "AC", "AD", "AE", "AF",
      "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8", "B9", "BA", "BB",
      "BC", "BD", "BE", "BF",
      "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB",
      "CC", "CD", "CE", "CF",
      "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7", "D8", "D9", "DA", "DB",
      "DC", "DD", "DE", "DF",
      "E0", "E1", "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB",
      "EC", "ED", "EE", "EF",
      "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "FA", "FB",
      "FC", "FD", "FE", "FF"
  };
  private final static byte[] val = {
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
      0x3F, 0x3F, 0x3F, 0x3F
  };
  public static String escape(String s) {
    StringBuffer sbuf = new StringBuffer();
    int len = s.length();
    for (int i = 0; i < len; i++) {
      int ch = s.charAt(i);
      if (ch == ' ') { // space : map to '+'
        sbuf.append('+');
      }
      else if ('A' <= ch && ch <= 'Z') { // 'A'..'Z' : as it was
        sbuf.append( (char) ch);
      }
      else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it was
        sbuf.append( (char) ch);
      }
      else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it was
        sbuf.append( (char) ch);
      }
      else if (ch == '-' || ch == '_' // unreserved : as it was
               || ch == '.' || ch == '!'
               || ch == '~' || ch == '*'
               || ch == '\'' || ch == '('
               || ch == ')') {
        sbuf.append( (char) ch);
      }
      else if (ch <= 0x007F) { // other ASCII : map to %XX
        sbuf.append('%');
        sbuf.append(hex[ch]);
      }
      else { // unicode : map to %uXXXX
        sbuf.append('%');
        sbuf.append('u');
        sbuf.append(hex[ (ch >>> 8)]);
        sbuf.append(hex[ (0x00FF & ch)]);
      }
    }
    return sbuf.toString();
  }

  public static String unescape(String s) {
    StringBuffer sbuf = new StringBuffer();
    int i = 0;
    int len = s.length();
    while (i < len) {
      int ch = s.charAt(i);
      if (ch == '+') { // + : map to ' '
        sbuf.append(' ');
      }
      else if ('A' <= ch && ch <= 'Z') { // 'A'..'Z' : as it was
        sbuf.append( (char) ch);
      }
      else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it was
        sbuf.append( (char) ch);
      }
      else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it was
        sbuf.append( (char) ch);
      }
      else if (ch == '-' || ch == '_' // unreserved : as it was
               || ch == '.' || ch == '!'
               || ch == '~' || ch == '*'
               || ch == '\'' || ch == '('
               || ch == ')') {
        sbuf.append( (char) ch);
      }
      else if (ch == '%') {
        int cint = 0;
        if ('u' != s.charAt(i + 1)) { // %XX : map to ascii(XX)
          cint = (cint << 4) | val[s.charAt(i + 1)];
          cint = (cint << 4) | val[s.charAt(i + 2)];
          i += 2;
        }
        else { // %uXXXX : map to unicode(XXXX)
          cint = (cint << 4) | val[s.charAt(i + 2)];
          cint = (cint << 4) | val[s.charAt(i + 3)];
          cint = (cint << 4) | val[s.charAt(i + 4)];
          cint = (cint << 4) | val[s.charAt(i + 5)];
          i += 5;
        }
        sbuf.append( (char) cint);
      }
      i++;
    }
    return sbuf.toString();
  }
  public static void main(String[] args) {
    System.err.println("" + Escape.escape("Jason_zhuo"));
    System.err.println("" + Escape.unescape("Jason_zhuo"));
  }
}
